Defiance County is a county located in the U.S. state of Ohio. As of the 2020 census, the population was 38,286. Its county seat and largest city is Defiance. The county was named after an early Army fortification, Fort Defiance, which was so named by Mad Anthony Wayne to signify the settlers' "defiance" of the Indians. The Defiance, OH Micropolitan Statistical Area includes all of Defiance County.

The 2020 United States presidential election in Ohio was held on Tuesday, November 3, 2020, as part of the 2020 United States presidential election in which all 50 states plus the District of Columbia participated. Ohio voters chose electors to represent them in the Electoral College via a popular vote, pitting the Republican Party's nominee—incumbent President Donald Trump and his running mate, Vice President Mike Pence—against the Democratic Party nominee, former Vice President Joe Biden and his running mate, California Senator Kamala Harris. Ohio had 18 electoral votes in the Electoral College.